#define _CRT_SECURE_NO_WARNINGS 1

#include <stdio.h>

int main()
{
    int n = 0;
    while (scanf("%d", &n) != EOF)
    {
        int start = n * n - n + 1;
        printf("%d", start);
        for (int i = 1; i < n; i++)
        {
            printf("+%d", start + i * 2);
        }
        printf("\n");
    }
    return 0;
}